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From: Woodie@DOCKMASTER.ARPA (Paul E. Woodie)
Newsgroups: net.micro.cpm
Subject: Re: Osborne Executive question
Message-ID: <1127@brl-tgr.ARPA>
Date: Tue, 31-Dec-85 11:27:46 EST
Article-I.D.: brl-tgr.1127
Posted: Tue Dec 31 11:27:46 1985
Date-Received: Thu, 2-Jan-86 04:33:51 EST
Sender: news@brl-tgr.ARPA
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There was a recent request for memory-map type information on the
Osborne Executive.  I have not had time to get all the information
requested, but I will provide some of it now and some later, as time
permits.

Bank 0:  The lower part contains system space and the upper part
contains most of bios and bdos.  The top part (4k, I think) is common to
all banks and is the normal way that the banks talk to each other.

Bank 1:  This is the normal user-accessable bank, it contains the cpm 3
base page, the TPA, and the common area in the highest addresses.

0-0ffh:  cpm 3 base page

100h-0f305h:  TPA

0f306h-0f8ffh:  p/o bios,bdos

The address of the warm start bios entry point in the jmp at 0000.

The address of the bdos entry point in the jmp at location 0005.

Banks 2-6:  Empty at present

Bank 7:  Contains video memory

Bank 8:  Start-up ROM, function key definitions,etc
                    in the lowest part of memory.